Naphthalene is fed to a phthalic anhydride production process. The feed is available at \(208^{\circ} \mathrm{C}\) and \(79 \mathrm{kPa}\). The flowrate is \(18,500 \mathrm{~kg} / \mathrm{h}\) in 1. 5 -in schedule- 40 pipe. A pump with NPSH characteristics as plotted in Figure 21. 9 is used. Will this pump be suitable for the desired duty? If not, what modifications would be necessary in order to use the existing pump? Be quantitative.

figure 21.9

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NPSH (kPa) NPSH (kPa) 1.2 1.0 0.8 0.6 0.4 0.2 Region of acceptable operation NPSHA Unacceptable operation due to cavitation 0.0 1.2 1.0 0.8 0.6 0.4 0.2 0 2 6 Velocity, v (m/s) 1 sch 40, h3 m, 55 C NPSH curves 1" sch 40, h = 2 m, 55C 0.0 0 2 4 6 NPSHR 00 8 8